Clare has offered a _______ of $ 100 to anyone who can find her lost cell phone.
| A．benefit | B．cost | C．reward | D．price |
At minus 130℃, a living cell can be _________ for a thousand year.
| A．spared | B．protected |
| C．preserved | D．developed |
Earth is believed ______ by an object the size of Mars at some point in the distant past before itssurface cooled.
| A．to be hit | B．to have hit |
| C．to have been hit | D．to hit |
our earth, or else it will be no longer fit for us to live on.
| A．Protected | B．To protect |
| C．Protecting | D．Protect |
With temperature ______ so rapidly, we could not go with the experiment.
| A．fall | B．falling |
| C．fallen | D．to fall |
They've won their last three matches, I find a bit surprising.
| A．which | B．that | C．when | D．what |